Rodless pump



July 5, 31938.

W. N. HUFF RODLESS PUMP Filed May 21, 1936 gmc/:wow:

` W/fer '/v. Huff rfi/fi Patented Julys, 193s i 2,123,139

UNITED STATES PATENT OFFICE RODLESS PURP Walter N. Huff, Harwood, 'I-ex.

Application May 21, 1936, Serial No. 81,111

2 Claims. (Cl. 103-44) This invention relates to pumps, especially Within the pressure cylinder 8 is a fluid tight those used in oil wells and the object thereof is valved piston I0 slidable in the cylinder 8. The to produce a pump of simple construction, which check valve I 0 closing the central opening in this is durable and efficient in operation. piston is confined by a cage as shown. Attached One object of the invention is to eliminate the to this piston preferably by means of a cage use of long lifting rods which in wells of great Structure as shown is a rod Il extending into the depth are a great disadvantage. pump cylinder 2. A cage I2 is attached to the Another object of the invention is to use preslower end of said rod II and to a valved piston sure generated by a `pump at the surface to com- I3 Capable 0f Sliding fluid-tight in Said Dump press a spring at the bottom of the well and use cylinder. A check valve I4, Opening upwardly iS the energy of expansion thus stored 1n the spring confined by the cage I2 and when seated closes to force the fluid above the surface. Other obthe aperture in valve piston I3. jects will appear from vthe following description. A second cage I5 is attached to the bottom This application is directed to improvements in of the piston and to this second cage a preferthe devices shown in applicants co-pending apably hollow lifting rod I6 is attached. While plcations Ser. No. 64,920 filed February 20, 1936, these various attachments are shown as formed now abandoned; Ser. No. 44,114 flied Oct. 8, 1935, by screw threads, any equivalent means of atnow Patent No. 2,058,455, dated Oct. 27, 1936; tachment may of course be used. Ser. No. 80,211 filed May 16, 1936; and Ser. No. The lifting Yrod passes through the collar 4 and 81,110 filed May 21, 1936 now Patent No. well down into the perforated cylinder 5. On this 2,095,602, .dated Oct. 12, 1937. i rod within the perforated cylinder is screwed' or The invention will be clearly understood from otherwise fixedly attached, a perforated washer the following detailed description, taken in con- Il shown in detail in Fig. 3. nection with the drawing, in which: A strong heavy coil spring I8 is confined with- Fig. 1 is a vertical cross-section with parts in the perforated Cylinder and bears against the shown in elevation, I perforated washer at one end and an inwardly Fig. 2 is a cross-section looking in the direction extending ange 0n the collar 6. As this spring of the arrows on line 2-2 of Fig. 1, reacts with great force after compression, a light Fig. 3 is a cross-section looking 1n the direccushioning spring I9 is confined in the upper nonif the arrows on une 3 3 of Fig. 1. portion of the perforated cylinder `bearing on The tubing reaching from the surface to a the Washer I1 and preferably attached thereto short distance above the bottom of the well is and bearing on the other end, at least when comdesignated by the numeral I. pressed, on the flange of the collar 4.

A cy1inder 8, hereinafter called the pressure The apparatus for applying pressure to the cylinder, of substantially less cross-section area fluid in the tube 2, releasing said pressure and than the tubing, is attached to the lower end of affording delivery to the oil is above the surface said tubing and to the lower end of said cylinder, of the g10l1nd, and Will now be described. This 8, is attached another cylinder 2, hereinafter aDparatllS COmPIiSeS a Dump 20, Single 01 multicalled the pumping cylinder, of substantially the plex and operated by a source of power not same diameter as the tubing, or in all cases of shown. greater cross-sectional area than pressure cyl- The pump hasl an accumulator 2| and a supply inder 8. These attachments may be made as pipe 22 leading from a source of supply 23. shown by a screw-threaded annulus or any pre- The accumulator may be of any type and may ferred fluid-tight means. comprise weights lifted by the pressure of air To the lower end of this cylinder 21s connected, confined and compressed by the liquid operated by means of a flanged stop collar 4, a perforated 0n by the Dumpcylinde'r 5 to the lower end of which a second Communicating with the accumulator is a hanged couar 6 is attached as by screw-threads. pipe 25 leading to a valve Casing 26. having three All of said collars are internally screw-threaded lateral Openings and a. revoluble three-Way Valve at each end as shown for attachment of the parts 21 therein fOr Putting desired Openings in 00mand each of the stop collars has an internal munication with each other. flange forl a purpose to be described later. To the The lower opening 0f Said Valve Casing has bottom collar 6 is attached any desired footing. attached thereto a pipe 28, the lower end of At the top of the tubing I is secured a cap 1 havwhich is attached to the cap 1. The tubing I ing an internally screw threaded aperture therein. is thus in communication with the pump and accumulator in one position of the valve, the delivery being shut off, while in another Aposition, as shown, the tubing I is in communication with the delivery pipe 29, leading to a storage tank l0.

The three-way valve is automatically turned through ninety degrees by any convenient mechanism as a link connection II shown, or a cam, actuated by any convenient source of power. The pump may be, but is not necessarily, used for this purpose. Ts 22 and 3l, respectively, forming parts of pipes 25 and 28 serve to connect a by-pass 3l to said pipes. A check valve 35 opening upwardly in the by-pass serves to correct any tendency to a vacuum above the three-way valve.

The operation of the device is as follows:

After some strokes of the pump the pressure rises, the valve 21 is automatically turned to place tubing I and the accumulator in communication, the delivery being thereby shut off.

'I'he fluid pressure acting on the piston I0 forces the same downward and holds valve I' closed thus cutting oil' communication between the tubing I and the cylinders below.

As the piston I0 descends, fluid must4 enter the tubing from the source of pressure and the volume of that fluid will be the internal crosssection of the pressure cylinder 8 multiplied by the vertical movement of the piston I0. Piston I3 is moved downwardly through the same distance as piston IU. Valve I4 is raised and fluid .flows into the upper part of pumping cylinder 2. The volume of fluid thus entering the upper part of pumping cylinder 2 is equal tothe internal cross-section of the cylinder 2 multiplied by the distance through which the piston I3 moves which is equal to the distance through which the piston I0 moves.

At the end of the downward stroke the volume of fluid above the piston I 3 is increased by the difference between the aforesaid volumes. Through rod I6 and washer I'I, spring I8 in the perforated cylinder has been compressed by the downward movement of piston I0.

'Ihe pressure on the fluid at the surface of tubing I is automatically released by oscillating the valve to close the communication with the source of pressure and open the communication with the delivery.

The energy stored in the spring I 8, raises the washer I1 and the piston I3. The valve in they piston I2 closes, valve I0' opens and fluid is forced through the delivery pipe. As the piston I3 reaches the upper limit of its stroke, valve 21 is oscillated to close communication with the delivery pipe and open communication with the source of pressure. The cycle of operations is then repeated.

In the operation of this device the fluid below the pumping piston is never subjected to the pressure of the pressure source and hence oil from the well may flow freely into the perforated cylinder to take' the place of that \removed. Moreover, largely owing to this fact, the casing usually in the well may if desired, be dispensed with.

Having fully described my invention and the operation thereof, what I claim is:

1. In a pumping apparatus, a fluid-tight tubing, means connecting the upper portion of said tubing alternately to a source of fluid pressure and to the atmosphere, a pressure cylinder of substantially less diameter connected to the lower end of said tubing, a piston having an aperture therein slidable in said cylinder, a check valve for closing said aperture on upward movement of said piston, a pumping cylinder of substantially greater diameter than said pressure cylinder secured to the lower end of said pressure cylinder, a valved pumping piston in said pumping cylinder, a rod connecting said pistons, a perforated cylinder, a collar securing said perforated cylinder to the lower end of said pumping cylinder, a lifting rod secured to said pumping piston and extending into said perforated cylinder, a perforated washer fixed on said lifting rod, a flanged collar fitted to the lower end of said perforated cylinder, a heavy spring surrounding the lower part of said rod and bearing at one end against the flange on the lower collar and on the other end against the washer whereby on alternately opening communication with the' source of fluid pressure and with the atmosphere fluid will be pumped from the tubing.

2. The device as claimed in claim 1 wherein the source of fluid pressure comprises a pump and an accumulator and the means connecting the tubing alternately to the source of fluid pressure and to the atmosphere comprises piping, a three-way valve in said piping and means for oscillating said three-way valve to open it to the source of pressure and the tubing, closing it to the atmosphere and to close it to the source of pressure and open it to the atmosphere and the tubing.

WALTER N. HUF'F. 

